Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 21331

GRB 170711A: Swift-BAT refined analysis
2017-07-12T19:23:15Z (7 years ago)
Hans Krimm at NSF/NASA-GSFC <>
C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), J. R. Cummings (CPI),
V. D'Elia (ASDC), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC),
D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU),
T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):

Using the data set from T-240 to T+962 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 170711A (trigger #761622)
(D'Elia, et al., GCN Circ. 21321).  The BAT ground-calculated position is
RA, Dec = 45.782, 47.845 deg which is
  RA(J2000)  =  03h 03m 07.7s
  Dec(J2000) = +47d 50' 41.2"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 100%.

The mask-weighted light curve shows a single FRED-shaped peak, starting at
T-2 sec, peaking at T+0 sec and decaying to background by T+6 sec.  This is
preceded by some weak, soft emission beginning at about T-25 sec.
T90 (15-350 keV) is 31.3 +- 7.6 sec (estimated error including systematics).

The time-averaged spectrum from T-31.66 to T+15.37 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.75 +- 0.10.  The fluence in the 15-150 keV band is 1.4 +- 0.1 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+0.02 sec in the 15-150 keV band
is 4.8 +- 0.2 ph/cm2/sec.  All the quoted errors are at the 90% confidence

The results of the batgrbproduct analysis are available at
Looking for U.S. government information and services? Visit